zimmerman's state of mind the night he followed trayvon martin and ultimately shot and killed him was one of anger and frustration built over time supported they claim by a five previous 911 calls about suspicious teenagers in his neighborhood, all of whom were black. here is a sample. >> there was a break in in my neighborhood recently. >> black, male or hispanics. >> two black males. >> can you describe the individuals. >> two african males. >> black, white or hispanic? >> black. >> zimmerman's attorney believes these previous calls are all good acts by george zimmerman with no connectivity at all with the night zimmerman spotted trayvon martin. >> they haled nothing and now they are trying to present sort of a stealth argument that we want you to believe he's bad because he was so good in the past he must be angry. >> nobody is calling this good act evidence. in fact, what is relevant about it is the fact that you can see